1.Yuav ua li cas yog lub zog tawm los ntawm qhov qis qis - carbon steel thiab cov qauv hlau dav dav?
Cov qib: SPCC (Tuam Tshoj), DC01 (European standard), JSC270C (Japanese standard), SAE1006/1008 (American standard)
Kev tawm dag zog ntau yam: 140 MPa - 280 MPa
Kev cuam tshuam ntawm xeev:
Annealed xeev (lub xeev mos): Lub zog qis zog (piv txwv li, 140-180 MPa), zoo plasticity, haum rau kev sib sib zog nqus nqus thiab sib sau ua ke.
Semi-lub xeev nyuaj, tag nrho lub xeev nyuaj: Lub zog yog nce (txog 280 MPa los yog ntau tshaj) los ntawm kev tswj qhov txias dov txo tus nqi thiab tom qab kev kho cua sov, tab sis plasticity txo.
2.Dab tsi yog qhov kev tawm dag zog ntawm siab -lub zog qis- alloy steel thiab qib siab siab - lub zog steel?
HSLA (piv txwv li, S355MC): Yield zog 300 MPa - 550 MPa.
Dual-theem steel (DP steel): piv txwv li, DP600, yield zog 300 - 400 MPa (tus cwj pwm los ntawm lub zog qis, siab tensile zog, thiab siab ua hauj lwm hardening tus nqi).
Kev hloov pauv -induced plasticity steel (TRIP steel): Muaj ntau dua formability thiab lub zog.
Martensitic steel (MS steel): piv txwv li, MS1200, yield zog tuaj yeem ncav cuag 800 MPa - 1400 MPa lossis siab dua.
3.Dab tsi yog qhov ntau ntawm cov khoom siv hluav taws xob rau hluav taws xob hlau (silicon steel)?
Tawm lub zog ntau yam: kuj qis, feem ntau ntawm 200 thiab 400 MPa.
4.Dab tsi yog qhov tseem ceeb cuam tshuam?
Kev kho cua sov hauv xeev (Qhov tseem ceeb tshaj):
Tag Nrho Lub Xeev Hardened: Txias- dov yam tsis muaj annealing, siab zog, tsis zoo plasticity.
Lub Xeev Annealed: Txias- dov ua raws los ntawm recrystallization annealing, softening cov khoom, ua kom plasticity, tab sis txo lub zog.
Quenching thiab Tempering: Annealing ua raws li lub teeb dov (smoothing), ua tiav lub zog tshwj xeeb, hardness, thiab ncaj.
Qhov sib txawv ntawm Thickness Direction: Vim yog kev ua hauj lwm hardening nyhuv ntawm txias dov, nyob rau hauv tib lub coil ntawm steel sawb, lub thinner seem feem ntau muaj me ntsis siab dua lub thicker seem.
Anisotropy: Txias dov ua rau cov nplej elongation raws cov kev taw qhia dov, ua rau lub zog me ntsis siab dua nyob rau hauv qhov kev taw qhia longitudinal (rolling direction) dua nyob rau hauv txoj kev hloov.
5.Dab tsi yog cov lus qhia xaiv cov khoom siv?
Cov duab sib sib zog nqus thiab sib sau ua ke (xws li tsheb lub cev vaj huam sib luag): High-zoo qis- carbon steel (annealed soft state).
Cov khoom siv dav dav, cov cuab yeej siv hauv tsev, thiab cov hlua khi: zoo tib yam qis- carbon steel (annealed lossis semi-hardened).
Cov khoom siv uas yuav tsum tau txo qhov hnyav lossis qee lub zog (cov qauv tsheb): Siab- zog qis- hlau alloy (HSLA)